Patient History: A 28-year-old G1 P1 woman has delivered vaginally 3 weeks ago. She is breastfeeding and notes that the baby prefers to breastfeed from the right breast. On the left breast, she notes a 3-day history of a tender mass on the upper outer quadrant. Physical Examination: She is afebrile.

The left breast has a fluctuant mass of 4 × 8 cm of the upper outer quadrant without redness. It is somewhat tender. What are the diagnosis and Treatment of this patient? Source: Case Files Obstetrics and Gynaecology